Well I use it all the time and it's a huge improvement to my life. The elegant and simple syntax makes testing endpoints so much easier than the verbose curl and wget alternatives...
I never said python is bad. What I mean is that httpie is not a strict improvement because it's written in python. Ripgrep for example is a strict improvement because it's safer, more performant, and has equivalent and extended features, without missing anything. The only advantage of grep over ripgrep is that it's much older and prevalent. With the exception of this advantage of age, one can say that X is a strict improvement over Y if it can do everything Y does but better, without doing anything worse.
Because HTTPie is written in python it has some disadvantages compared to curl or wget: it's not as performant, it's dependent on the Python interpreter, and less portable. If these don't matter to you, than you should use HTTPie. But it's not a strict improvement, so it's not something I can recommend to everyone, because some people will care about these things. Ripgrep and fd on the other hand I can recommend to everyone without any worry.
At what point you need computing performance on an I/O bound task?
The only performance that matters in http requests is async support. You can have 1000 pararel curl processes and will still be dusted by a single async python process.
That may be true, that has never matter to me. What has mattered however is portability. But it doesn't really matter what weaknesses there are, what matters is that they exist. Because they exist, HTTPie is not a strong of recommendation as ripgrep or fd.
You can think of it as a spectrum ranging from incomparable to strictly better. So you can't say that one should use Python over grep for example; you can't even compare the two because that doesn't make sense. They aren't even in the same space. Ripgrep however is a strict improvement over grep, it is faster, more featureful, safer, and has no downsides (with the exception of age, as I've mentioned).
I think HTTPie is very close to the end of the spectrum of being a strict improvement, but it's held back by various little things that don't matter to many but still matter.